Ghost Dragon Horn

Wondrous item, very rare

Scales from dead dragons cover this wooden, curved horn. You can use an action to speak the horn’s command word and then blow the horn, which emits a blast in a 30-foot cone, containing shrieking incorporeal dragon heads. Each creature in the cone must make a DC 16 Wisdom saving throw. On a failure, a creature tales 8d10 psychic damage and is frightened for 1 minute. On a successful save, a creature takes half as much damage and isn’t deafened. Dragons have disadvantage on the saving throw and take 16d10 psychic damage instead of 8d10. A frightened target can repeat the Wisdom saving throw at the end of each of its turns, ending the effect on itself on a success.

If the horn’s magic targets a dragon, it has a 20% chance of causing the horn to explode. The explosion deals 16d10 psychic damage to the blower and destroys the horn.

Once you use the horn, you can’t use it again until the next dawn. You can also regain the use of the horn after you kill a dragon and complete a short or long rest.